堆存陈化对磷石膏理化性能的影响研究  

Effect of aging on physicochemical properties of phosphogypsum

作　　者：余意 马梦雨 刘颖 陈小红[1,2] 朱淼 陈绍华 叶恒朋 YU Yi;MA Mengyu;LIU Ying;CHEN Xiaohong;ZHU Miao;CHEN Shaohua;YE Hengpeng(Hubei Engineering Research Center for Prevention and Control of Heavy Metal Pollution,College of Resources and Environment,South-central Minzu University,Wuhan 430074,China;Key Laboratory of Catalytic Conversion and Energy Materials Chemistry,Ministry of Education,South-central Minzu University,Wuhan 430074,China;China School of Xingfa Mining,Wuhan Institute of Technology,Wuhan 430074,China)

机构地区：[1]中南民族大学资源与环境学院,湖北省重金属污染防治工程技术研究中心,湖北武汉430074 [2]中南民族大学催化转化与能源材料化学教育部重点实验室,湖北武汉430074 [3]武汉工程大学兴发矿业学院,湖北武汉430074

出　　处：《新型建筑材料》2024年第4期57-62,共6页New Building Materials

基　　金：湖北省重大科技专项(2022ACA004-6)。

摘　　要：以某化工厂磷石膏为研究对象,通过XRD、FI-TR、SEM以及化学分析等方法测试与表征得出不同粒径下生料以及陈化半年后的磷石膏杂质含量、微观形貌、晶体特性的变化。研究表明:总磷含量随磷石膏粒径的减小从1.07%逐渐增加至1.46%;可溶氟含量由0.58%降低到0.10%;铁含量由0.35%增至0.72%;有机质含量减少了17.6%;短期陈化不会改变磷石膏的pH值。此外,陈化过程会影响磷石膏各粒级的质量分布,并且增大磷石膏的平均粒径;粒径较大的磷石膏中存在的杂质含量高于粒径较小的磷石膏;磷石膏部分物相CaSO_(4)·2H_(2)O在陈化过程中会失去结合水转化为CaSO_(4)·0.5H_(2)O,部分晶型由菱形变为短棒状。X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),field emission scanning electron microscopy(SEM),and chemical analysis were employed to investigate the variation of impurity content,microstructure,and crystal characteristics of raw and aged phosphogypsum from a chemical factory at different particle sizes.The results showed that the total phosphorus content gradually increased from 1.07%to 1.46%with decreasing particle size,the soluble fluorine content decreased from 0.58%to 0.10%with decreasing particle size;the iron content increased from 0.35%to 0.72%,the organic matter content decreased by nearly 17.6%,short-term aging did not change the pH of phosphogypsum,in addition,the aging process affected the mass distribution of the phosphogypsum in each particle size and increased the average particle size of phosphogypsum.The impurity content in phosphogypsum with larger particle sizes was higher than that in phosphogypsum with smaller particle sizes.Phosphogypsum aging under part of the physical phase CaSO_(4)·2H_(2)O in the aging process will lose the binding water converted to CaSO_(4)·0.5H_(2)O,part of the crystalline form from rhombic to short rod.

关 键 词：磷石膏 陈化 杂质 理化性质 

分 类 号：TU526[建筑科学—建筑技术科学]